Hi, I'm at altitude in Denver...
My current setup: 71 318la bored +.030, stock 318 heads, stock lifters, comp cam Thumper (20-600-4 279/296lift), 340 intake, 1/2" plenum w/ Holley 4150 600cfm carb. Hughes 3000stall conv., a904, 276gears.
I have a set of X heads and Weiand stealth intake (port...